60 HYMENOPTEEA. 



length of the stigma from the base of the latter, and curves towards it, so that the 

 base is wider than the apex ; the basal nervure is interstitial ; the transverse median 

 nervure is received a little in front of the middle of the cellule. The mesonotum is 

 finely shagreened ; the head is yellow from below the ocelli ; the cloud in the wings 

 extends from the apex of the stigma to the edge of the wing. 



THULEA. 



Thulea, Say, Bost. Journ. i. p. 213 (1835) ; Norton, Trans. Ainer. Ent. Soc. i. p. 49. 



l. Thulea nigra. 



Thulea nigra, Say, Boston Journ. i. 1835, p. 213 * ; Norton, Trans. Amer. Ent. Soc. i. p. 49 ; 

 Catal. p. 19. 1. 



Hdb. Mexico 1 . 



I cannot make out, from the description, the precise affinities of this genus, and 

 place it provisionally here, as it must be related either to Perantherix or to the Cimbi- 

 cina. The antennae are 6-jointed ; there are one radial and three cubital cellules, of 

 which the second and third receive each a recurrent nervure. No mention is made of 

 the presence of spines on the tibiae, or if the lanceolate cellule is absent. 



Subfam. PERBEYINA. 



Antennae 10-14-jointed, the joints moniliform or thickened towards the apex; in 

 male sometimes flabellate. Wings with one radial cellule, appendiculated, and four 

 cubital cellules. Lanceolate cellule petiolate. Hind wings with an appendicular 

 cellule. One discoidal cellule and no accessory nervure. Palpi short, thick. Maxil- 

 lary palpi 2-4-jointed, labial 1-3-jointed. 



This group has usually been regarded as a section of the Lophyrina ; but it differs 

 in so many points not only from that group, but from all others, that I am justified, I 

 think, in making a distinct section of it, and have given above the distinctive characters 

 of the subfamily. 



I have not sufficient material at hand to enable me to form a definite idea as to the 

 genera ; but, provisionally at least, I would arrange them as follows : — 



A. Antennae 10-11-jointed. Labial palpi 1-jointed, maxillary 3-jointed . . Decameria. 



B. Antennas more than 11 -jointed. 



1. The antennae more than 13-jointed, flabellate in the male. Maxillary 



palpi 4-jointed, labial 3-jointed. Second recurrent cellule usually 

 receiving both recurrent nervures; appendicular cellule in hinder 

 wings very small Lophyroides. 



2. The antennae 13-jointed. Maxillary palpi 2-jointed, labial 1-jointed. 



Second recurrent nervure usually receiving only one recurrent nervure ; 

 appendicular cellule in hind wings large Perreyia. 



